Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air carry sludge pumping option compared to standard pumped methods.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a serious housing development, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating price. The relocation also allowed for an improve from 13,000 inhabitants to fifteen,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby nice screens, a vortex grit removal unit and two 15.5m diameter primary settling tanks adopted by biological treatment in seven trickling filters with two 16.7m humus settlement tanks. Sludge produced in the humus settlement tanks is delivered to a chamber alongside the tanks and then flows by gravity to re-enter the method upstream of the first settlement tanks.
Simple, low opex sludge pumping
For this important responsibility, MMB chosen the te-sewpas pulsed air lift pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW responsibility aspect channel air blower, actuated air management valves, air manifold and management panel housed inside a weatherproof GRP enclosure and is delivered to website absolutely assembled and tested. Each pulse of air lifts a quantity of sludge and discharges it from the sludge discharge pipe. A programmable timer in the PLC allows the frequency and duration of desludging to be adjusted to permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring constant desludging.
The unit could be situated near the tanks that it serves with versatile air delivery hoses routed by way of ducts to every of the desludge chambers. The air delivered is scorching and as a result there is not any want for thermal lagging or insulation. เกจวัดแรงดัน10bar -sewpas unit can serve as much as four main or humus tanks with typical individual air supply hose length as a lot as 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the 2 humus tanks. Rather than utilizing the standard management panel, MMB determined to integrate the te-sewpas controls into the central PLC and Te-Tech supplied a useful design specification for this function. The venture was accomplished in October 2019. “We’ve been using the air lift systems of assorted makes on our sites for the last 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly strong and we determined to retrofit extra methods rather than typical progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of these two systems was completed in April 2021.
Significant entire life cost savings
The te-sewpas system provides vital entire life price financial savings when in comparability with standard pumped techniques. For a typical set up serving two tanks, like the Stocksbridge challenge, based mostly on an estimated 25% reduction in the electrical power consumption and lowered upkeep requirements, te-sewpas provides a 40% decrease capital value and 50% discount in operational value in comparison with a pumped desludge system.
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